我瞎说哈,大概是在质量概念上统一起来滴? 
嗯,大概对有长度有密度的固体才有可能吧 :-)
本帖于 2026-03-13 11:26:46 时间, 由普通用户 最西边的岛上 编辑
我瞎说哈,大概是在质量概念上统一起来滴? 
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